//I/O库函数
#include <stdio.h>
#include <stdlib.h>
#define BLKSIZE 4096
FILE *fp,*gp;
char buf[4096];

int main(int argc,char *argv[ ])
{
    int n,total=0;
    if(argc<3) exit(1);
    fp=fopen(argv[1],"r");
    if(fp==NULL) exit(2);
    gp=fopen(argv[2],"w");
    if(gp==NULL) exit(3);
    while(n=fread(buf,1,BLKSIZE,fp)){
        fwrite(buf,1,n,gp);
        total+=n;
    }
    printf("total=%d\n",total);
    fclose(fp);
    fclose(gp);
}
